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Old 31 May 2007, 10:24   #1
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Osprey with twin outboards

Hi All

I know there are a lot of Osprey and ex-Osprey owners out there . Finally sold my Avon Searider 4.0 and am looking for something in and around 5.3 to 5.5m
Saw a Osprey 5.5m with twin Honda 45hp . Do you think that this rig would be under powered with the 45ís ? . The whole set up is around 15 years old , am I looking at trouble regarding the outboard and the tubes at this age ?. I donít know what sort of life they have had but it wasnít used commercially . Havenít seen it yet just looking for opinions before/if I view .

Thanks
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Old 31 May 2007, 18:25   #2
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I have an osprey viper 5.25 with twin 60 mariner 2 strokes, the formula for working out the power of the combined 2 engines is add the two together and take away around 25% from the total so 45x2= 90 - 25%=68. Around 70 hp is enough for the boat but you might find it wanting when loaded up with 3 or 4 divers and kit.
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Old 31 May 2007, 18:44   #3
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Forgot to mention about the tubes etc, if the boat has been looked after i.e stored under cover and washed down often then the tubes should still be fine but only viewing can tell this, ospreys are very well made craft so a 15 year old boat should still be serviceable at worst, but again only viewing will tell, as for sea keeping look no further .
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Old 01 June 2007, 03:44   #4
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Quote:
Originally Posted by Tims Osprey View Post
I have an osprey viper 5.25 with twin 60 mariner 2 strokes, the formula for working out the power of the combined 2 engines is add the two together and take away around 25% from the total so 45x2= 90 - 25%=68. Around 70 hp is enough for the boat but you might find it wanting when loaded up with 3 or 4 divers and kit.
Thanks Tim

Sounds like it could be a bit underpowered at 68hp . Might still go and have a look . Its over the other side of the country so its not going to be this weekend .

Tim
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Old 01 June 2007, 04:31   #5
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Well... What you could sell a pair of 60's for would buy you a 115 Yam and give you change
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Old 01 June 2007, 12:26   #6
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I have a Viper 525 with twin mariner 40, 2 stroke. which we brought new in the early 90ís

Ok it will never break any speed records, but will easily cruise at 20-25 Knts with a top speed of just under 30.

We use the boat for cruising and diving, but do not notice any discernable difference when loaded. Besides I have found with 4-6 divers on board, a cruising speed of 20-25 is all that is really needed.

Our Viper is nearing 15yrs old although you would never know by looking at it.

Although you saty the rib is 5.5m so although it may not be a viper, the Manufacturers data at the time (Northern Diver / Offshore Components) listed the maximum two engine arrangement for a 525 as twin 50ís Ė so if it is a viper the 60ís may be an issue.
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Old 01 June 2007, 12:33   #7
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Although you saty the rib is 5.5m so although it may not be a viper, the Manufacturers data at the time (Northern Diver / Offshore Components) listed the maximum two engine arrangement for a 525 as twin 50ís Ė so if it is a viper the 60ís may be an issue.
Shouldn't be-the 60 2 strokes from that era are the same basic engine as the 50 and weigh the same.
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Old 01 June 2007, 17:56   #8
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Get um on there thats what i say, the 60's on the back of my boat work a dream with the massive beam on the viper going slightly over the manufactures recommended max for twin installation does no harm at all, there no heavier than the average 50 and still fall short of the max power recommendations after deducting 25%, so whats the problem?
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Old 02 June 2007, 05:59   #9
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Hi All


....Saw a Osprey 5.5m with twin Honda 45hp .....
So, when did these Honda 45s become 60hp?
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Old 02 June 2007, 17:25   #10
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On that basis

when did Honda 45 become a 45 hp engine? arent those babies measured at the crank
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